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An electron microscopy study of graphite growth in nodular cast irons

Laffont-Dantras, Lydia and Jday, Rawen and Lacaze, Jacques An electron microscopy study of graphite growth in nodular cast irons. (2018) Metallurgical and Materials Transactions A, 49 (4). 1287-1294. ISSN 1073-5623

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Official URL: http://dx.doi.org/10.1007/s11661-018-4508-4

Abstract

Growth of graphite during solidification and high-temperature solid-state transformation has been investigated in samples cut out from a thin-wall casting which solidified partly in the stable (iron–graphite) and partly in the metastable (iron–cementite) systems. Transmission electron microscopy has been used to characterize graphite nodules in as-cast state and in samples having been fully graphitized at various temperatures in the austenite field. Nodules in the as-cast material show a twofold structure characterized by an inner zone where graphite is disoriented and an outer zone where it is well crystallized. In heat-treated samples, graphite nodules consist of well-crystallized sectors radiating from the nucleus. These observations suggest that the disoriented zone appears because of mechanical deformation when the liquid contracts during its solidification in the metastable system. During heat-treatment, the graphite in this zone recrystallizes. In turn, it can be concluded that nodular graphite growth mechanism is the same during solidification and solid-state transformation

Item Type:Article
Additional Information:Thanks to Srpinger editor. The original PDF of the article can be found at https://link.springer.com/article/10.1007%2Fs11661-018-4508-4
HAL Id:hal-01780360
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:27 Apr 2018 12:25

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